package lishizheng.demo05;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.SimpleTimeZone;

//模拟倒计时
public class TestSleep2 {

    public static void main(String[] args) {
//        try {
//            timeDown();
//        } catch (InterruptedException e) {
//
//        }

        //打印当前系统时间
        Date startTime   = new Date(System.currentTimeMillis());//获取系统当前时间

        while (true){
            try {
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
                startTime   = new Date(System.currentTimeMillis());//更新时间
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    //模拟倒计时：10~1
    public static void timeDown() throws InterruptedException {
        int num = 10;

        while (true){
            Thread.sleep(1000);
            System.out.println(num--);
            if(num < 0) break;
        }
    }
}
